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An Area-Efficient Output Driving Scheme Using a DAC Sharing Method for AMLCD Column Drivers
Seungchul Jung,전용준,Jin-Yong Jeon,이형민,조규형,Young-Suk Son 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
A novel output driving scheme is proposed to reduce the active matrix liquid crystal display (AMLCD) driver size, especially, the digital-to-analog converter (DAC) size. In this scheme, two channels share one DAC, and the effective area of the DAC in a column driver is reduced by half. Both two column drivers write their data simultaneously; the writing time can be almost the same as one horizontal time, not half. The offset voltage of the operational amplifier is averaged in 2 frames. A simulation is performed with Cadence SPECTRETM under a 0.35-μm CMOS process. The simulated integral nonlinearity (INL) result is less than ±0.11 LSB, and differential nonlinearity (DNL) is less than ±0.014 LSB with 10-bit color depth. A novel output driving scheme is proposed to reduce the active matrix liquid crystal display (AMLCD) driver size, especially, the digital-to-analog converter (DAC) size. In this scheme, two channels share one DAC, and the effective area of the DAC in a column driver is reduced by half. Both two column drivers write their data simultaneously; the writing time can be almost the same as one horizontal time, not half. The offset voltage of the operational amplifier is averaged in 2 frames. A simulation is performed with Cadence SPECTRETM under a 0.35-μm CMOS process. The simulated integral nonlinearity (INL) result is less than ±0.11 LSB, and differential nonlinearity (DNL) is less than ±0.014 LSB with 10-bit color depth.
Seungchul Jung,Gyu-Hyeong Cho IEEE 2014 IEEE transactions on industrial electronics Vol.61 No.12
<P>This paper presents a high-efficiency offline isolated LED driver based on a flyback converter. In order to achieve high power conversion efficiency as well as a low-cost design, a simple passive lossless turn-off snubber is proposed to reduce the switching loss of the power switch. A primary-side power regulation scheme is also proposed to compensate for forward voltage variation and aging caused by process and temperature variations. The proposed control scheme is designed and fabricated on-chip using a 0.35- μm BCDMOS process. Test results of the proposed LED driver show an efficiency level that exceeds 83% (up to 90%) in an output range of 5-10 W with an input range of 85-265 V<SUB>AC</SUB>.</P>
Changes in prevalence of Helicobacter pylori infection after subtotal gastrectomy.
Suh, Seungchul,Nah, Jong Chun,Uhm, Min Sik,Jung, Youn Mu,Kim, Nayoung,Lee, Dong Ho,Jung, Hyun Chae,Song, In Sung G. Thieme 2012 Hepato-gastroenterology Vol.59 No.114
<P>There have been few reports comparing pre and postoperative prevalence of Helicobacter pylori infection and gastritis in patients with gastric cancer surgery.</P>
Yoo, Seungchul,Jung, Kwanghee,Nguyen, Vinh T.,Piscarac, Diana 국제문화기술진흥원 2020 International Journal of Advanced Culture Technolo Vol.8 No.2
In this study, we introduce a multi-modal mixed reality (MR) application for advertising the main touristic landmarks on Jeju Island, and evaluate its effectiveness based on the Technology Acceptance Model (TAM) with a focus on the user's involvement in Korean culture (K-Culture). Specifically, we deployed several stimuli to enable users to retrieve information, visualize a variety of heritage content such as text, images, videos, virtual artifacts, and immerse in a VR environment to experience the heritage locations. The results of the online survey with 436 participants showed that for consumers with low K-Culture involvement, Perceived Usefulness and Perceived Ease-of-Use did not affect their Intention to Visit the island. Still, it had a significant impact on their Intention to Use the application. On the other hand, for the group with high K-Culture involvement, Perceived Usefulness had no effect on the Intention to Use and Intention to Visit. However, Perceived Ease-of-Use had a significant impact on their Intention to Use the application and Intention to Visit Jeju Island. Therefore, when user involvement in K-Culture is high, convenience of use has played a significant role in sensory media usage and the intention to visit, regardless of the usefulness of the mixed reality content. In contrast, users with low K-Culture involvement primarily focused on the functional aspects of the application. These findings open the path for follow-up studies on K-Culture involvement and immersive media tourism marketing, which will benefit digital tourism marketing and Korea's tourism industry.